Mincing machine



Mafc'h 1 1927.

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Patented Mar. 1, 1927.

e UNITED STATESI i v,1,e1a99o PATENT orllg,y

GORDON JoIIN ivrn'r'rnns, or WAYvILLn, AND KENNETHk WILLIAM NoLAN, or ST." Y PETERS, SOUTH AUSTRALIA, AUSTRALIA.

MINCING IvI'AenINn.`

Application led January 15,1925, Serial-No. 2,556, and in Australia September 4, 1924.

Our invention relatesto improve-mentsl in mincing machines, the principal objects of 'our invention being to .reduce friction between the cutting knife and the discharge plate, and to arrange -the constru'ctional parts in suchy a manner that the casting which constitutes the hopper and screw cylinder is detachable fromv the gear chamber and supporting stand, but is held in central alignment therewithA by specially arranged studs, and the thrust of the worm instead of being taken against the'back wall of the 'casting comprising the cylinder and hopper is received by anti-friction thrust ball bear-v ings fitted into a race which is .accommodated in a small chamber orrecess formed i on the back portion of the machine rearward of the worm and concentric with the driving spindle. p v

The Supply of lubricating oil is so arv Y ranged that the oil cannot gain access to the meat which is being passed through the cylinder. The removableA perforated discharge plate rests in a recess in the end of the cylinder in such a manner as to permanently retain its relative position when properly set and secured bythe annular screw cap so that it presses against the shoulder of the recess so formed and not against the knife. p

Hitherto it has been customary to screw the perforated discharge plate hard up against the cutting knife by means of a nose cap or other device. With the construction which we use, we render it impossible to screw the discharge plate with suiiicient pressure to cause undue friction gainst the cutting knife. This condition is due to the use of the thrust ball bearing arranged and used as described, which prevents any back movement of the cutting knife and consequently renders itv possible to adjust the cutting knife and discharge plate so accurately that their surfaces make contact with each other without causing any appreciable amount of friction. The cutter is held by a hardened steel lock nut which rotates in a ground hole or bearing in the discharge plate.

But in order that our invention may be more clearly understood .wev will now describe the same by aid of the accompanying illustrative drawings wherein z- Fig. l is a sectional side elevation o f our machine.

Fig. 2 is a cross secti-on of Vmachine through line X-X.

Figs. 3 and'i, part sectional view of vfront and back portions of machine on larger scale. t f

Fig. 5, back portion of machine in section with compound bearings for power'drive. Fig. 6, front .view of cutting knife. Y In each of the illustrations similar letters of reference are used to denote 'similar or corresponding parts'whcrev-er they occur.

In the drawings a is the foundation casts ing adaptedto be secured to a bench or table by any convenient means. lVithin this casting we provide the gear chamber b which may be closed with a cover plate 0,' this chamber accommodates thev toothed wheel and pinion l and e which may be driven either by hand or by motive power. A

Leading fromr the gear chamber into `the body of the casting are two oil ducts fand g provided for lubrication purposes; 'the lubricating oil vis regulated by the rotation of the gear wheel so that when carried into therupper portion of the chamber it finds Yits way into the vupper duct f and after being brought into use for lubricating purposes gravitates backthrough the lower duct g, the oil being inaccessibley to the worm chamber. y

The casting is bored out to receive vthe bearing bushes "h of phosphor'bronze ory other anti-friction material, within which the spindle i of the driving mechanism rotates, said spindle terminating in a clutch enlargement y', the boring of the passage being still further enlarged for the accommodation of the end of the castingcomprising the hopper and screw cylinder hereinafter referred to, and it is important to note that a shoulder or abutment is also formed in the casting for the accommodation of the anti-friction thrust ball bearing le which forms a thrust Vfor the back portion of the clutch enlargement y' previously described.

' These parts are clearly shown particularly in Fig. il of the drawings by which arrangement the bearing balls receive the whole of the back pressure from the screw or worm. A guiding screw and binding screw are provided for securing the principal casting together and are mounted in screw threaded holes in the back casting as illustrated. `With this arrangement the upper screw Z acts as a guide or key which 1s accommodated in the elongated groove s in the detachable casting whilst the studs Z lit accurately into holes Z2 drilled in the detachable casting for their reception.

The Lprincipal detachable casting .is characterized by having a hopper m, a cyl-indrical chamber n, a screw threaded end 0, having a recessed shoulder p formed therein, whilst at the opposite end of the casting there is a shank g very accurately fitted into the foundation casting, this portion of the structure being shouldered at 1 so that the two principal castings abut firmly against each other and are guided by the stud Z in 2- the grooves S and alternately secured by the studs or screws Z previously mentioned.

Within this detachable casting we also provide bearing slee-ve t which are made of anti-,friction meta-l and within which the shank u of the worm or screw f1; is rotatably supported, the end of the shank being formed as a clutch preferably so as to fit into and be driven by the Vclutch enlargemently' of the spindle of the driving mechanism previously described- The cutting knife is indicated at w and is formed with a series of cutting blades, substantially of triangular section, there being preferably four in number which are integral with the boss and radiate therefrom as in Fig. 6, thecomplete knife being mounted on a screw threaded spindle which is secured by a round lock nut of hardened steelwhich rotates in a ground hole or bearing in the centre of the perforated discharge plate y, the inner edge of which abuts firmly against the recess or shoulder p of the detachable casting and is tightly held thereon by means of the screw threaded annular cap 2.

In Fig. 5 the general principles and constructionll parts are substantially similar to those previously described, but this figure indicates the arrangement of the working parts as used for direct belt drive, the essential elements of our invention as previously described being used therewith. In this arrangement the lubricating ducts f and 'g may be replaced by 'an ordinary lubricating cup f. The thrust which is taken by a shoulder formed in the solid portion of the foundation casting in the arrangement shown in Fig. l is more conveniently taken in the belt driven machine by a corresponding shoulder formed in the adjustable bush indicated at 702 in Fig. 5 which may be fitted with an antifriction liner, the bush being rendered adjustable by a screw threaded adjustment liner 7c3 which can be held in its adjusted p0- sition by a lock nut kt.' Tith this arrangement it may be desirable to supply an lintermediate radial ball bearing and race as at lo and a collar or flange such as z arranged between a radial ball jrace and the thrust, but the intermediate radial ballraceis not an essential fitting, and the collar or flange i vis an equivalent of and corresponds with, or is a part of, the relative enlargement of the clutch j which forms a shoulder to take the thrust against the ball race la in the other figures. V

We claim:

A standard for mincing machines having a bore in one side thereof adapted to receive the shank of a mincing machine, said bore terminating at its interior by a shoulder, a thrust bearing seatedin said shoulder and concentric with theV bore, a concentric bore passing through the thrust bearing and standard tol receive a shaft, and a recess .on

the opposite side of the standard to receiveV the gearing.

In testimony whereof we have signed our l names to this specification.

, GORDQN JOHN METTERS.

KENNETH VILLIAM N GLAN. 

